Tesla TF-E621-BKN_310 Men 13 D(M) Men's Lightweight Sports Running Shoe E621 (Recommend 1 Size up) * Alert : Choose 1 size UP ! We Strongly recommend based on customers feedback ex: usual size MEN 7 (D) &gt; MEN 8(D) * 1.5 size up for Customer's with wide feet based on customers feedback. ex: usual size MEN 7 (2E) &gt; MEN8.5(D) ****12-07-16 Updated size guide based on customer's comments*